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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.18 DHW storage tank
6.18.1 Types of heat request
When a DHW charging request to the boiler, the electric immersion heater is made, a
sensor or thermostat must be connected to terminal B3.
Available sensors
Type of heat request to the boiler/electric immersion
heater
B3 B31
--
No DHW request
Sensor --
B3/SD
Sensor Sensor
B3/SD or B3 start/B31 stop
Thermostat
Contact start/stop
Key
-- No sensor connected
With or without sensor
SD Switching differential
6.18.2 DHW charging with one sensor
In the case of DHW heating with one sensor (B3), the charging request is made via a 2-
position controller.
If the DHW temperature is lower than the current setpoint minus the set switching
differential, DHW charging is started.
DHW charging is ended when the temperature reaches the current setpoint.
When DHW heating is released for the first time in the morning, forced charging takes
place, which means that DHW charging is also started when the DHW temperature lies
within the switching differential. But if the temperature lies less than 1 K below the
setpoint, charging will not take place.
Note!
If a sensor is connected to terminal B31, it can be used for solar integration.
Line no. Operating line
5012 Dhw forced charging
5022 Type of charging
5024 Switching diff
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